Straight-line knife



l" J. B. GILLESPIE.

STRAIGHT LINE KNIFE.

APPLICATION FILED OCT. 10, 1919.

1,379,973., 1 3 56 115911 May 31, 1921.

JOHN B. GILLESPIE, OF HOQUIAM, WASHINGTON.

STRAIGHT-LINE "KNIFE.

7 '0 all whom it may concern:

Be it known that I, JOHN B. GILLEsrm,

a citizen of the United States, residing at- Hoquiam in the county of Grays Harbor and State of Washington, have invented certain new and useful Improvements in Straight-Line Knives, of which the following is a specification. v

One of the objects of my invention is to produce a knife of such construction that it will not be deflected from its course alon the edge of a square by checks in the woo or by the grain of the wood, and one which will make a well defined line in rough timber. A further object of my invention is to adapt my improved straight line knife for use in connection with metal and other materials; and with these and other objects in view my invention consists of the parts and combination of parts as will be hereinafter set forth.

In the drawings Figure 1 is a side elevation of a straight line. knife embodying my invention.

Fig. 2 is a transverse sectional view on the line 2-2 Fig. 1.

Fig. 3 is a transverse sectional view on the line 3-3 Fig. 1. i

Fig. 4 is an enlarged detail plan View of the teeth on one side of the knife.

Fig. 5 is an enlarged detail plan view of the teeth on the other side of the knife.

The reference numeral 1 designates the blade of the knife, which may be made of any size or desired width, to which is secured the handle 2 by means of suitable rivets or the like 3.

The blade 1 is provided on its opposite edges with oppositely disposed knife edges along the square edge.

Specification of Letters Patent. Patented May 3 1, 1921, Application fi led October 10, 1919.- Serial No. 329,662.

4 .and 5 whereby the knife may be used either as a right or a left hand tool. These knife edges extend from the handle 2 for a considerable distance, as shown in the drawin and are merged into saw like teeth 6 and that portion of the-blade having the saw'like teethbeing gradually tapered toward its/end where the blade terminates in a blunt or flat portion 8 having a saw tooth 9 at each end tov facilitate the holding of the knife in line until the end of the proposed mark is reached.

The teeth 6 are of the usual saw tooth construction or configuration, while the teeth 7 are nearer the shape-of a pyramid as shown clearly in Fig. 5.

The knife edge enables one to make a very thin guideline along the edge of a square while the saw like teeth enables one to make 4 a dee guide line in hea or rough timber p ibe combined action of the knife edges and the teeth prevent the knife from being deflected fromgthe edge of the square by checks, splits orthe I grain in the lumber being marked, thus insuring a true straight line along the edge of the square. What'I claimis:

A straight line knife comprising avflat blade tapered at one end,'saw teeth on one edge of the tapered end all beveled in the same direction, each tooth having a flat face in the plane of one face of the blade, and pyramidical saw teeth on the opposite edge of the tapered end in alineme-nt with each other anddis osed in a direction opposite to the bevel o the first named teeth.

In testimony whereof I afiix my si nature.

. JOHN B. GILLE 'PIE, 

